import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

/*
 * FileChooserDemo.java uses these files: images/Open16.gif images/Save16.gif
 */
public class FileChooserDemo extends JPanel implements ActionListener
{
    static private final String newline = "\n";
    JButton openButton, saveButton;
    JTextArea log;
    JFileChooser fc;

    public FileChooserDemo()
    {
        super(new BorderLayout());

        // Create the log first, because the action listeners
        // need to refer to it.
        log = new JTextArea(5, 20);
        log.setMargin(new Insets(5, 5, 5, 5));
        log.setEditable(false);
        JScrollPane logScrollPane = new JScrollPane(log);

        // Create a file chooser
        fc = new JFileChooser();

        // Uncomment one of the following lines to try a different
        // file selection mode. The first allows just directories
        // to be selected (and, at least in the Java look and feel,
        // shown). The second allows both files and directories
        // to be selected. If you leave these lines commented out,
        // then the default mode (FILES_ONLY) will be used.
        //
        // fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        // fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

        // Create the open button. We use the image from the JLF
        // Graphics Repository (but we extracted it from the jar).
        openButton = new JButton("Open a File...",
                createImageIcon("images/Open16.gif"));
        openButton.addActionListener(this);

        // Create the save button. We use the image from the JLF
        // Graphics Repository (but we extracted it from the jar).
        saveButton = new JButton("Save a File...",
                createImageIcon("images/Save16.gif"));
        saveButton.addActionListener(this);

        // For layout purposes, put the buttons in a separate panel
        JPanel buttonPanel = new JPanel(); // use FlowLayout
        buttonPanel.add(openButton);
        buttonPanel.add(saveButton);

        // Add the buttons and the log to this panel.
        add(buttonPanel, BorderLayout.PAGE_START);
        add(logScrollPane, BorderLayout.CENTER);
    }

    public void actionPerformed(ActionEvent e)
    {

        // Handle open button action.
        if (e.getSource() == openButton)
        {
            int returnVal = fc.showOpenDialog(FileChooserDemo.this);

            if (returnVal == JFileChooser.APPROVE_OPTION)
            {
                File file = fc.getSelectedFile();
                // This is where a real application would open the file.
                log.append("Opening: " + file.getName() + "." + newline);
            }
            else
            {
                log.append("Open command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());

            // Handle save button action.
        }
        else if (e.getSource() == saveButton)
        {
            int returnVal = fc.showSaveDialog(FileChooserDemo.this);
            if (returnVal == JFileChooser.APPROVE_OPTION)
            {
                File file = fc.getSelectedFile();
                // This is where a real application would save the file.
                log.append("Saving: " + file.getName() + "." + newline);
            }
            else
            {
                log.append("Save command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());
        }
    }

    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path)
    {
        java.net.URL imgURL = FileChooserDemo.class.getResource(path);
        if (imgURL != null)
        {
            return new ImageIcon(imgURL);
        }
        else
        {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event dispatch thread.
     */
    private static void createAndShowGUI()
    {
        // Create and set up the window.
        JFrame frame = new JFrame("FileChooserDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Add content to the window.
        frame.add(new FileChooserDemo());

        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args)
    {
        // Schedule a job for the event dispatch thread:
        // creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                // Turn off metal's use of bold fonts
                UIManager.put("swing.boldMetal", Boolean.FALSE);
                createAndShowGUI();
            }
        });
    }
}
